JP4468827B2 - Plasma display panel back plate - Google Patents

Description

  The present invention relates to a plasma display panel (PDP). More specifically, the present invention is composed of a woven (or braided) aluminum base metal composite material (or a metal composite material mainly composed of aluminum). It relates to a back plate of a plasma display panel (PDP).

  A plasma display is an element that displays characters or graphics using light emitted from plasma generated during gas discharge (or gas discharge), and is an element that uses the gas discharge phenomenon, so it is a gas discharge display. Also called an element. The plasma display is classified into a direct current type or an alternating current type by an electric field application driving method applied from the outside in order to generate plasma, and the structure itself, that is, the structure of the display cell, the material of the electrode, the creation cost and the type of the discharge gas, etc. It is a factor that determines the function and characteristics of the plasma display.

  The plasma display has characteristics that are more advantageous than other flat panel elements, such as a large size of 40 inches or more, easy colorization, and a wide viewing angle. The next-generation high-definition wall-mounted television (TV) and television (TV ) And computer (PC) functions are considered to be promising as a display device for multimedia, and interest in this is increasing.

  FIG. 1 is a schematic cross-sectional view of a conventional PDP (PDP) structure, and FIG. 2 is a schematic cross-sectional view of the driving principle of a conventional PDP (PDP). According to what is shown here, PDP (Plasma Display Panel) after adding some necessary films on the two flat glass forming the front plate (10) and the back plate (20). The display device is completed by attaching them to each other.

  The front plate (10) is provided with a display electrode (12) in which a scan electrode and a sustain electrode are mutually arranged to protect the electrode from ion bombardment of plasma and to prevent wall charges. A dielectric layer (Dielectric Layer 14) is formed so that the discharge is maintained by the discharge sustain voltage that is accumulated and alternating. Under the dielectric layer (14), magnesium oxide is prevented from being easily sputtered by ion bombardment in plasma during discharge to shorten the life of the panel. A protective film (16) of (MgO) is formed.

Then, after an address electrode (22 ) for writing data (Data) is provided on the back plate (20), a dielectric layer (24) is formed in the same manner as the front plate (10), and discharge is performed. A partition wall (26) is installed to maintain electrical distance and prevent electrical / optical crosstalk between adjacent cells. When the externally stimulated electrons change from the ground state to the excited state (or exciting state) and return to the ground state again around the dielectric layer (24) and the partition wall (26), the energy A phosphor (28) that emits the difference between the two is applied, and the phosphor (28) is composed of three primary colors of light, red (R), green (G), and blue (B).

  On the other hand, when the operation principle of the PDP configured as described above is examined, an inert gas (He, Ne, Ar, etc.) is interposed between the front plate (10) and the back plate (20). A discharge gas is injected, and an electric energy is applied to the discharge gas thus injected to discharge it, thereby radiating ultraviolet rays. Then, ultraviolet rays in a specific wavelength band among such ultraviolet rays cause the phosphor (28) of the back plate (20) to emit light to produce visible light, and we can see images through the screen.

However, the conventional techniques as described above have the following problems.
The back plate 20 is made of glass, and PD200 and soda lime are mainly used as its material. As shown in FIG. 1, a frame (20a) is attached to the lower surface of the back plate (20) with an adhesive (20c). A heat radiating plate (20b) and a frame (20a) are attached to the lower surface of the frame (20a). A heat dissipating fan (not shown) is further attached.

  Therefore, there is a problem that the back plate (20) becomes thick and heavy, and noise and vibration are generated by the operation of the heat radiating fan. In addition, due to the PDP characteristics, a large amount of heat is generated, so that it is necessary to use an additional high-priced member, and there is a problem that additional electromagnetic shielding needs to be considered when designing a circuit.

  An object of the present invention for solving the above-described problems is a plasma composed of a woven (or braided) aluminum-based metal composite material (or a metal composite material mainly composed of aluminum). It is to provide a back panel of a display panel (PDP).

  In order to achieve the above-mentioned purpose, the back plate of the plasma display panel (PDP) according to the present invention has a display electrode, a bus electrode, a dielectric layer, and a protective film formed on the front plate, and an address on the back plate. In the structure of a plasma display panel (PDP) in which electrodes, dielectric layers, barrier ribs, and phosphors are formed, the back plate is made of a metal composite material. In addition, the metal composite material is preferably a metal composite material in which aluminum or an aluminum alloy is a base metal (or aluminum or an aluminum alloy is a main component).

  The metal composite material is a metal composite material using carbon fiber or silicon carbide fiber as a reinforcing material. The metal composite material is an aluminum-based metal composite material formed in a woven mold.

  The back plate of the plasma display panel (PDP) according to the present invention as described above was made of an aluminum-base metal composite material formed in a woven mold.

Therefore, the specific gravity of the aluminum-base metal composite material can be reduced to 2.35 or less compared to the specific gravity of the glass which is the material of the conventional back plate is 2.5, which is advantageous for reducing the weight of the PDP. In addition, it has the advantage that it has excellent rigidity and can be made thinner than glass (thickness 3 mm), and can be matched so that the thermal expansion coefficient is equal to the glass of the front plate. In addition, since the high-temperature thermal conductivity characteristics are more than 100W / mK and much better than glass, the heat sink and heat sink attached to the back plate can be removed, and the total thickness of PDP is innovative. In addition to being thin, it also has excellent damping characteristics, and it is expected that removing the heat sink can solve the problems of noise and vibration.

  In addition, there is no need to use an additional high-priced member for solving the generation of a large amount of heat due to the characteristics of PDP (PDP), and furthermore, by using a metal composite material having a high thermal conductivity, an additional to this In addition to suppressing the generation of costs, it is also expected that the generated heat can be easily dissipated and the service life can be improved.

  In addition, since the metal composite material has electromagnetic shielding characteristics, there is no need to consider additional electromagnetic shielding during circuit design. This makes the environmental friendliness applied to the product very excellent, so consumers are eager to purchase products. This leads to an improvement effect.

  According to the back panel of the plasma display panel (PDP) according to the present invention having such a configuration, the back panel is thin and light, and the heat conductivity is high, so that the generated heat can be easily dissipated and the service life is improved. There are advantages that can be made. The preferred embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

  FIG. 3 is a perspective view of the structure of a plasma display panel (PDP) in which a preferred embodiment of the present invention is adopted, and FIG. 4 is a back view of the plasma display panel (PDP) according to the preferred embodiment of the present invention. A partial cross-sectional view showing the face plate is shown.

  FIG. 5 is a schematic cross-sectional view illustrating the operating principle of a plasma display panel (PDP) in which a preferred embodiment of the present invention is adopted. FIG. 6a is a diagram illustrating a woven structure according to the preferred embodiment of the present invention. A schematic plan view is shown illustrating a braided (or braided) reinforcement and an aluminum-based (or aluminum-based) metal composite, and FIG. 6b is a preferred embodiment of the present invention. A partially enlarged three-dimensional sectional view showing a woven reinforcement and an aluminum-based metal composite according to an embodiment is shown.

  The plasma display panel (PDP) is an existing video display system connected to various input signals (PC, Video, HDTV, etc.) as a futuristic digital video display that is often talked about on a wall-mounted television (TV). Large screens larger than 10 inches can be realized with a thickness of 10 cm or less, and it has great advantages in terms of space utilization and aesthetic design.

  PDP (Plasma Display Panel) is a Flat Panel Display Divice that displays images using plasma generated by gas discharge (or gas discharge). Applied voltage and discharge structure Are classified into an indirect discharge type (AC drive type) and a direct discharge type (DC drive type). The major structural difference is that the direct discharge type has a simple structure, but the electrode is exposed to the discharge space and has to create an external resistance for current limiting, while the indirect discharge type covers the electrode with a dielectric. Therefore, there is an advantage that a natural current can be limited and the electrode can be protected from ion bombardment at the time of discharge, thereby extending the life compared to the direct discharge type.

  The direct discharge type (DC drive type) is a method in which the electrode is exposed to the discharge space and driven by a DC voltage, and since it is driven by the refresh method, the drive circuit is simple, but discharge is performed to prevent seeding (priming) discharge. A panel structure is a little complicated because a barrier is installed between the cells.

  In the above-mentioned direct discharge type PDP (PDP) structure, each cell is independent by a partition, and an anode and a cathode are formed on a front plate and a back plate, and there is a current limiting resistor. And it is comprised so that a discharge gas may be charged and a direct current (DC) power supply may be applied in the state which sealed the front plate and back plate with which such a cell etc. were comprised.

  The front plate is formed with an anode (the partition is not necessary here) in a direction perpendicular to the cathode, that is, in parallel with the partition, and the front plate and the back plate are joined together and the end thereof is attached in a vacuum state. Finally, when a gas is injected, a discharge protection resistance is inserted between the anode and the cathode and a direct current (DC) voltage is applied, light is emitted at the intersection.

  On the other hand, in the indirect discharge type (AC driving type), the electrode is coated with a thin glass component insulator and driven with a pulse voltage of about 200 KHz.

  There are two types of drive systems: a memory system that discharges once a low sustaining voltage is applied after discharge, and a refresh system that discharges by applying a high pulse voltage between the electrodes that must be displayed. is there.

  In an indirect discharge type PDP (PDP) structure, each cell is independent by a partition, and electrodes are formed on a front plate and a back plate. A sinusoidal AC voltage or a pulse voltage is applied to each electrode. A discharge is caused so that the light diverges and the image can be seen through the front plate. In such an indirect discharge type PDP (PDP) structure, vertical electrodes are installed in parallel on the back plate as in the direct discharge type, and the electrodes are insulated by a dielectric. It is important to insulate the electrodes regardless of the use of gas discharge, and magnesium oxide (MgO) is deposited on the surface of the dielectric to improve the discharge characteristics.

  The direct discharge type is further divided into a counter discharge type and a surface discharge type. The counter discharge type has a problem in that the life of the phosphor is shortened by a phosphor thermal fire caused by ion bombardment, whereas the surface discharge type has a problem in that the phosphor discharges the discharge. The problem of the counter discharge type structure is overcome by gathering it on the opposite side and minimizing the phosphor heat fire, and it is used in most current PDP structures.

  FIG. 3 is a perspective view of the structure of a PDP (PDP). As shown here, a PDP (Plasma Display Panel) adds several necessary films on the two flat plates forming the front plate (100) and the back plate (200), It is a display device that is completed by attaching them to each other.

  The front plate (100) is provided with a display electrode (120) in which a scan electrode (120b) and a sustain electrode (120a) for maintaining selection and emission of data are maintained. A bus electrode (130), which is a connection electrode for supplying power, is further installed on one side of the display electrode (120).

The back of the display electrode (120) and the bus electrode (130) is protected from discharge by an electric discharge sustaining voltage that protects the electrode from plasma ion bombardment and accumulates wall charges. A dielectric layer (Dielectric Layer 140) is formed. In order to prevent the back of the dielectric layer 140 from being easily sputtered by ion bombardment in plasma during discharge, the lifetime of the panel is shortened. A protective film (160) of MgO) is further formed.
Further, after an address electrode (220) for writing data (Data) is provided on the back plate (200), a dielectric layer (240) is formed in the same manner as the front plate (100). A barrier rib 260 is installed on one side of the body layer 240 to prevent electrical / optical crosstalk between adjacent cells by maintaining a discharge distance.

  When the externally stimulated electrons change from the ground state to the excited state and return to the ground state again around the dielectric layer (240) and the partition wall (260), the energy difference is emitted by light. Such a phosphor (280) is applied, and the phosphor (280) is composed of the three primary colors red (R), green (G), and blue (B).

On the other hand, the back plate (200) is made of a metal composite material (214). The metal composite material (214) is composed of a matrix metal (or a main component metal) and a reinforcement material (Reinforcement) that are macroscopically mixed to have characteristics suitable for the intended use. is, thermal stable, non strength, thermal conductivity, abrasion resistance, has the advantage of excellent dimensional stabilization, etc., such as the designer to suit the required properties of the user can design, good design Flexibility can be provided.

The metal composite material (214) can be classified according to base metal and reinforcing material, and aluminum (Al) alloy, copper (Cu) alloy, titanium (Ti) alloy, etc. are mainly used as base metal, As the reinforcing material, silicon carbide (SiC), alumina (Al ₂ O ₃ ), carbon (Carbon), or the like may be used. Of these, the most commonly used metal composite material is an aluminum-based metal composite material (214), which has an advantage that almost no outgassing, which is an important factor in the manufacture of a plasma display panel (PDP), occurs. Therefore, a metal composite material (214) in which aluminum or an aluminum alloy is used as a base metal (210) is desirable as the material of the back plate (200).

  The aluminum base metal composite material (214) is a carbon fiber (Carbon Fiber: PAN type carbon fiber or Pitch type carbon fiber) or a silicon carbide fiber (SiC Fiber) having excellent hardness and rigidity. More preferably, the base metal (210) is a woven aluminum base metal composite (214) formed of aluminum or an aluminum alloy.

Woven aluminum base metal composites are woven into various forms of textile preform using weaving technology (or braiding technology), and then woven into aluminum or aluminum alloy. It is an advanced composite material that has been infiltrated and molded. Such woven molding composite material (Textile composites) are excellent thermal stable properties, with a high thermal conductivity and dimensional stabilization, excellent transverse elasticity coefficient and hardness, front resistance, fracture toughness, only mar resistance, etc. In addition, there is an advantage that it is easy to handle because it has a high possibility for near-net-shaping and automatic processes.

Molding close to the above-mentioned mold can be machined, mechanically fastened, and scrap minimized, and the automatic process reduces the manufacturing unit price and improves the quality of the product. A woven freeform close to a normal shape can be directly produced by a weaving, braiding, knitting, or stitching apparatus. These free-form are produced in the product by liquid process can be innovatively shorten the manufacturing process time (Liquid process), if the polymer composite, a typical process is resin transfer molding (Resin Transfer Molding: RTM) In the case of a metal composite material, it is a liquid pressing process.

  In the following, the operating principle of the plasma display panel (PDP) having the above-described configuration will be examined carefully.

  FIG. 5 is a schematic sectional view showing the light emission principle of a plasma display panel (PDP). As shown here, PDP (PDP) emits light through plasma generation by gas discharge (or gas discharge). As a discharge gas used for a plasma display plate, helium (He), neon (Ne), argon (Ar) or a mixed gas thereof is used to form a buffer gas, and the phosphor (280). Is emitted, and a small amount of xenon (Xe) gas is mixed with the aforementioned buffer gas at the center of vacuum ultraviolet light.

  The PDP has a structure in which a large number of phosphor (280) spaces in which a gas discharge phenomenon occurs between the front plate (100) and the back plate (200). The front plate (100) and the back plate ( 200) maintains a small interval of 0.1 mm, and an inert gas is injected into such an interior.

  When a voltage is applied between the front plate 100 and the back plate, a gas discharge phenomenon occurs, and ultraviolet rays are generated at this time. Such ultraviolet rays are applied to the red (R), green (G), and blue (B) phosphors (280) on the side surfaces of the dielectric layer (240) and the partition wall (260) to generate visible light. Necessary images can be realized by combining light.

  The scope of the present invention is not limited to the embodiments exemplified above, and other variations based on the present invention are possible for those skilled in the art within the above technical scope. It should be.

FIG. 6 is a schematic cross-sectional view of a conventional plasma display panel (PDP) structure. It is the schematic sectional drawing which showed the drive principle of the conventional plasma display panel (PDP). 1 is a perspective view of a plasma display panel (PDP) structure employing a preferred embodiment of the present invention. 1 is a partial cross-sectional view illustrating a back plate of a plasma display panel (PDP) according to a preferred embodiment of the present invention. 1 is a schematic cross-sectional view illustrating an operation principle of a plasma display panel (PDP) in which a preferred embodiment of the present invention is employed. 1 is a schematic plan view illustrating a woven reinforcement material and an aluminum-based metal composite material according to a preferred embodiment of the present invention; FIG. FIG. 3 is a partially enlarged three-dimensional cross-sectional view illustrating a woven reinforcing material and an aluminum-based metal composite material according to a preferred embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Front plate 120 Display electrode 120a Sustain electrode 120b Scan electrode 130 Bus electrode 140, 240 Dielectric layer 160 Protective film 200 Back plate 210 Base metal 212 Reinforcement material 214 Metal composite material 220 Address electrode 260 Bulkhead 280 Phosphor

Claims (1)

In the plasma display panel in which display electrodes, bus electrodes, dielectric layers, and protective films are formed on the front plate and address electrodes, dielectric layers, barrier ribs, and phosphors are formed on the back plate , the back plate is It is formed of a metal composite material in which the main component metal and reinforcing material are mixed.
The metal is at least one metal selected from aluminum, an aluminum alloy, a copper alloy, and a titanium alloy,
The back plate of a plasma display panel, wherein the reinforcing material is one or more materials selected from silicon carbide, alumina, carbon, carbon fiber, and silicon carbide fiber .

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